The earliest signs of pregnancy include spotting and occasional cramping, according to WebMD. Pregnancy cramps are similar to menstrual cramps, so many women don't relate them to pregnancy.
Breasts may also become tender early in pregnancy, usually a week or two following implantation, as the hormone levels begin to change rapidly, explains WebMD. The area around the nipple, called the areola, may also become dark. Women also tend to become more tired in the early weeks of pregnancy, and this usually occurs within a week of conception. This is also due to the influx of hormones.
Nausea is a common symptom of pregnancy, but not all women become nauseous during pregnancy, states WebMD. Often, women also develop an aversion to certain food during pregnancy, which may contribute to nausea. Most women only experience nausea for the first couple of months of pregnancy, but for some women, nausea occurs throughout pregnancy.
The most common early symptom of pregnancy is a period that never occurs, according to WebMD. However, there are many other reasons a woman may miss her period. Additionally, many women also experience bleeding during pregnancy, which may be normal, but can also be a sign of an emergency situation.